It is possible to produce agricultural crops throughout the year using greenhouse horticulture in the cold snowy region. However, heating costs for creating the optimal cultivation environments are high - e.g. (Ohashi, Nakano, 2005). In addition, agricultural production in the greenhouse without oil consumption is desired for the realization of a low-carbon society. In order to reduce oil dependency, the heat pump for cooling and heating without oil consumption has aroused remarkably concern again in recent years, especially the water heat pump and air source heat pump which has been widely used in the agricultural field On one hand, the heating efficiency of air source heat pumps decreases due to defrost on the heat exchanger of the outdoor unit in winter of the cold snowy region - e.g. (Furuno et al., 2009).On the other hand, the water heat pump which uses groundwater heat is expected to have the ability of stable operation in winter. However, the problem remains in aspect of the initial investment such as the digging cost of the groundwater well, which restricts the development of water heat pumps. In this study, I focused on the use of the existing equipment which included the groundwater system for melting snow that is popular in the cold snowy region and the agricultural water that is popular in the agricultural areas. Those existing equipment were used as heat supplies and an environment conscious heating and cooling system was build in the greenhouse to reduce the initial investment cost. Comparison with the practices cultivated by oil boilers in winter, CO2 emission was reduced by approximately 12 % by the present system. Furthermore, this system also created a cool environment in summer with a temperature of 20 degrees C in the greenhouse by using the agricultural water. Therefore, the usefulness of the environment conscious heating and cooling system all year round by using the water heat pump was confirmed